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1. Show that the quantization of angular momentum L = n U follows from Bohr's Assumption D that the mean value K of the kinetic energy of the electron- nucleus system is given by K = nhforb/2. Assume a circular orbit.
2. (a) Calculate the energies of the three lowest states of positronium.
(b) Determine the wavelengths of the Ka, K/3, La, and L/3 transitions.
3. Careful measurements of light from a distant galaxy show that the longest observed wavelength in the Lyman series of hydrogen is 137.15 nm. If the galaxy is moving directly away from us, what is its velocity?
What does a straight line segment in a graph of position versus time mean
A 1.1 kg block of ice is initially at a temperature of -5°C. If 4.8 ? 105 J of heat are added to the ice, what is the final temperature of the resulting liquid water
A sled of mass 50.0 kilogram is pulled along flat, snow-covered ground. The static friction coefficient is 0.30, and the kinetic friction coefficient is 0.10. Determine what does the sled weigh
A child slides down a playground slide; the coefficient of the kinetic friction is uk=0.15, with what speed does she exit the slide
A bus is traveling up a hill at a speed of 34m/s. The hill is 23 degrees relative to horizontal and the coefficient of static friction between the bus's tires and the road is 0.6
Using a fast-pulsed laser and electronic timing circuitry, you find that light travels a distance of 2.55m within a plastic rod in a time interval of 10.9ns. What is the refractive index of the plastic
Camera lenses are explained in terms of their focal length. A 50 mm lens has a focal length of 50 mm. A camera is focused on an object 110 m away using a 830mm lens.
If 58.4kW is to be transmitted over two 0.130Ohm lines, estimate how much power is saved if the voltage is stepped up from 115V to1240V and then down again, rather than simply transmitting at 115V. Suppose the transformers are each 98.8 percent effic..
question eight 5 microc charges are located at the vertices of a unit cube centered about the origin with 1.0 mm edges.
A protostar has a temperature of 3000 K,radius of 2*10^8 km at stage 4. At stage 6, Calculate the star's change in absolute magnitude as it evolves from stage 4 to stage 6
The distance between two successive minima of a transverse wave is 2.35 m. Find the frequency of the wave
Determine the stopping distances for an automobile with aninitial speed 90 km/h and human reaction tim of 1.0s for anaccerleration a=-4.0 and a=8.0
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